Fili and Kili are sneakers because they are often used as scouts. Options for Bard, Eagles or Beorn reflect three of the more obvious helps that are found in the story. Bombur is left off as he goes in the camp sleeping....

And, for a very condensed group from the battle of five armies there is:

Thorin Oakenshield, Fili and Kili (Hero General)Gandalf and Bilbo (Magician or Hero)Oin, Gloin, Dwalin and Balin (Blade)Dori, Ori and Nori (Blade)Bifur, Bofur and Bombur (Blade)Thranduil and Mirkwood Elves (Shooter)Bard the Bowman and Men from the Long Lake (Shooters x 2)Beorn (Beast)The Lord of Eagles and Eagles from Misty Mountain (Flyer)

I favor hero for Gandalf and Bilbo as magic figures very little in most of the stories, same in LotR. But, that is just a personal take on it and others will likely have other views.